550721623 has 2 divisors, whose sum is σ = 550721624. Its totient is φ = 550721622.

The previous prime is 550721621. The next prime is 550721627. The reversal of 550721623 is 326127055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 550721623 - 2¹ = 550721621 is a prime.

Together with 550721621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550721621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275360811 + 275360812.

It is an arithmetic number, because the mean of its divisors is an integer number (275360812).

Almost surely, 2^550721623 is an apocalyptic number.

550721623 is a deficient number, since it is larger than the sum of its proper divisors (1).

550721623 is an equidigital number, since it uses as much as digits as its factorization.

550721623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 550721623 is about 23467.4588100203. The cubic root of 550721623 is about 819.6794419242.

Adding to 550721623 its reverse (326127055), we get a palindrome (876848678).

The spelling of 550721623 in words is "five hundred fifty million, seven hundred twenty-one thousand, six hundred twenty-three".